EP 0363189 B1 19940518 - Three state emitter coupled logic circuit with a small amount of current consumption.
Title (en)
Three state emitter coupled logic circuit with a small amount of current consumption.
Title (de)
Emittergekoppelte logische Schaltung mit drei Zuständen und niedrigem Stromverbrauch.
Title (fr)
Circuit logique à trois états à émetteurs couplés présentant une faible consommateur de courant.
Publication
Application
Priority
JP 25268188 A 19881006
Abstract (en)
[origin: EP0363189A2] A three state emitter coupled logic circuit has a logic circuit (11) responsive to an input logic signal (LG) and a three state control signal (CNT), a difference circuit (12) formed by two series combination of resistors (R11 and R12) and bipolar transistors (Q11 and Q12) coupled in parallel as well as a constant current source (Q13 and R13) coupled between the difference circuit and a constant source (Vee), and an emitter follower circuit (Q14 and R14) coupled to an intermediate node (18) between one of the resistors and one of the bipolar transistors for producing an output signal, and a bypassing circuit (NM) is provided in parallel to the constant current source for increasing the amount of current passing through the difference circuit in the presence of the three state control signal of the active level, so that the voltage level at the intermediate node is varied out of the usual voltage range for the logic function mode, thereby the three state emitter coupled logic circuit being established in the high impedance state.
IPC 1-7
IPC 8 full level
H03K 19/0175 (2006.01); H03K 19/082 (2006.01); H03K 19/086 (2006.01)
CPC (source: EP US)
H03K 19/0826 (2013.01 - EP US); H03K 19/086 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0363189 A2 19900411; EP 0363189 A3 19900816; EP 0363189 B1 19940518; DE 68915381 D1 19940623; DE 68915381 T2 19941020; JP 2743401 B2 19980422; JP H02100419 A 19900412; US 5006731 A 19910409
DOCDB simple family (application)
EP 89310177 A 19891004; DE 68915381 T 19891004; JP 25268188 A 19881006; US 41611689 A 19891002